Never occurred to me before, but here "substitutes" reads to me as being commuta...

pbhjpbhj · on Oct 23, 2015

Substitute works IMO the same way replace does[1].

Substitute poison for healthy food.

Substitute poison with healthy food.

The first means you take away healthy food and give poison. The later means you take away poison and give healthy food.

[1] Except that "replace X for Y" sounds weird, except in the common phrase "replace like for like" (and probably some others!).

dmd · on Oct 23, 2015

In that case, you won't mind if I substitute poison for your favorite tasty beverage.

kps · on Oct 23, 2015

Technically, my favorite tasty beverage is poison.